Foamma 4" x 20" x 22" High Density Upholstery Foam Padding, Thick-Custom Pillow, Chair, and Couch Cushion Replacement Foam, Craft Foam Upholstery Supplies, Foam Pad for Cushions and Seat Repair : Amazon.ca:
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Upholstery Padding: What to Use for Your Preferences
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1/4" Foam Padding w/Scrim Backing - Home and Automotive Upholstery and Crafts | eBay